Method for preparing ethanediol by homogeneous catalytic hydration of epoxyethane

A technology of ethylene oxide and homogeneous catalysts, applied in hydrolysis preparation, organic chemistry, etc., can solve the problems of catalyst separation and recycling difficulties, low selectivity of ethylene glycol, large amount of catalyst, etc., and achieve high catalytic activity and selectivity, shorten the reaction time, improve the effect of selectivity

Inactive Publication Date: 2006-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there is a large amount of catalyst used in the prior art, difficulty in catalyst separation and recycling, and long reaction time or long reaction time and low selectivity of ethylene glycol when no catalyst is used. A new method for preparing ethylene glycol by homogeneously catalyzed hydration of ethylene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take by weighing 34.2 grams of ethylene oxide, 200 grams of water, 0.023 grams of catalyzer aluminum perchlorate (catalyst consumption 100PPM in the reaction medium), add in 500 milliliters of stainless steel autoclaves, electric heating control reaction temperature 150 ℃, reaction pressure is 2.0 MPa, the reaction time is 6.0 minutes, stop the reaction, take a sample and analyze the reaction liquid after cooling, the conversion rate of ethylene oxide is 100%, and the selectivity of ethylene glycol is 92.1%.

Embodiment 2

[0020] Take by weighing catalyzer aluminum perchlorate 0.17 gram (catalyst consumption 50PPM in reaction medium), be dissolved in 3000 gram waters, the above-mentioned container that the water that is dissolved with catalyzer is housed is placed on electronic balance, the ethylene oxide is housed The steel cylinder is placed on another electronic scale, and two metering pumps are used to feed the aqueous solution with catalyst and ethylene oxide to the continuous tubular reactor respectively. The amount of feed is adjusted and controlled by the metering pump according to the reading of the electronic scale. The aqueous solution and ethylene oxide enter the tubular reactor after being fully mixed by the static mixer. The continuous tubular reactor is a stainless steel tube with a length of 120 meters and a diameter of φ3 mm (the inner diameter of the tube is φ2 mm, and the reactor volume is 376 milliliters). In oil bath, control reaction temperature at 150 ℃, reaction pressure 1...

Embodiment 3

[0022]Take by weighing 34.1 grams of ethylene oxide, 200 grams of water, and 0.12 grams of catalyst aluminum trifluoromethanesulfonate (500 PPM of the catalyst in the reaction medium), add them into a 500 milliliter stainless steel autoclave, and control the reaction temperature by electric heating to 150 ° C. The reaction pressure was 1.4 MPa, the reaction time was 10 minutes, and the reaction was stopped. After the reaction liquid was cooled, a sample was taken for analysis, and the conversion rate of ethylene oxide was 100%, and the selectivity of ethylene glycol was 88.9%.

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PUM

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Abstract

The invention relates to a kind of method of manufacturing ethylene glycol by homogeneous catalysis hydration with ethylene epoxide. The invention mainly solves the problems existed in previous technique, such as large use amount of catalyst, difficulty of separate and reclaiming-recycling usage, longer reaction time or long reaction time with no catalyst, and low selectivity of ethylene glycol. In the process of homogeneous catalysis hydration to manufacture ethylene glycol with ethylene epoxide, the invention uses neutral salt or weak acid salt or their mixture that all have solubility in reaction medium as catalyst, and controls the weight percent concentration of catalyst in reaction system with 10-3000ppm. The technique scheme described above can solve the problems mentioned above, and can be used in industrial production of homogeneous catalysis hydration to manufacture ethylene glycol with ethylene epoxide.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol through the homogeneous catalytic hydration of ethylene oxide. Background technique [0002] Ethylene Glycol (EG or MEG for short), commonly known as glycol, is an important aliphatic dihydric alcohol. [0003] Ethylene glycol has a wide range of uses, the largest use is the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as coolant and antifreeze, and it is also an indispensable substance in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0004] The direct hydration method of ethylene oxide is the only method for industrial production of ethylene glycol today, and the production technology is monopolized by Shell, SD, and UCC. About 70% of the ethylene glycol plants in the world use the technologies of SD and Shell. The mola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/09
Inventor 陈永福何文军费泰康王嘉华
Owner CHINA PETROLEUM & CHEM CORP
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